US20050110463A1 - Charging system and method - Google Patents
Charging system and method Download PDFInfo
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- US20050110463A1 US20050110463A1 US10/722,804 US72280403A US2005110463A1 US 20050110463 A1 US20050110463 A1 US 20050110463A1 US 72280403 A US72280403 A US 72280403A US 2005110463 A1 US2005110463 A1 US 2005110463A1
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- Prior art keywords
- power supply
- input power
- supply signal
- switch
- charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
Definitions
- This invention relates in general to charging systems and more particularly, to charging systems that rely on rectified charging currents.
- portable electronic devices In today's marketplace, portable electronic devices have become ubiquitous. Because they are portable, nearly all of these devices include rechargeable batteries as their power supply. Such portable devices are equipped with a charger, which can be incorporated in the device or can be a stand-alone unit that can receive the portable device. In either embodiment, the charger typically receives an AC input signal and converts this signal to a DC signal, which is then fed to the cells of the battery. These types of chargers generally include a rectifier that rectifies the incoming AC signal.
- a rectified signal will have a series of voltage peaks and valleys.
- a capacitor is typically provided in the portable device to supply charging current to the battery as the signal decreases during the voltage valleys. Unfortunately, the capacitor must be relatively large to maintain the necessary voltage, which takes up valuable space in the portable device and adds to the expense of the device or charger.
- the present invention concerns a method of charging a battery.
- the method includes the steps of receiving an input power supply signal, monitoring the input power supply signal to determine when the input power supply signal reaches first and second predetermined thresholds and in response to the monitoring step, selectively controlling a charging switch that controls the flow of the input power supply signal to the battery.
- the controlling step includes activating the switch when the input power supply signal reaches the first predetermined threshold and deactivating the switch when the input power supply signal reaches the second predetermined threshold.
- the method can be practiced in an electronic device that is powered by the battery and that includes a capacitor for maintaining a voltage to indicate that the electronic device is being charged. Practicing the method in the electronic device can reduce the minimum value of the capacitor as compared to the minimum value required of a second capacitor that is used to provide voltage to the battery when the input power supply signal drops below the second predetermined threshold.
- the method can also include the step of synchronizing with the controlling of the charging switch the control of a second switch that regulates current flow to a circuit.
- the second switch to the circuit can be activated when the charging switch is activated and deactivated when the charging switch is deactivated.
- the circuit can be a backlighting circuit.
- the method can further include the steps of performing the receiving, monitoring and controlling steps in a wireless charging system and rectifying the input power supply signal.
- the magnitude of the second predetermined threshold can be higher than the magnitude of the first predetermined threshold.
- the present invention also concerns a charging system for charging a battery.
- the system includes a coil for receiving an input power supply signal, a charging switch for controlling the flow of the input power supply signal to the battery and a controller.
- the controller can be programmed to monitor the input power supply signal to determine when the input power supply signal reaches first and second predetermined thresholds and in response to the monitoring process, selectively control the charging switch.
- the controller can selectively control the charging switch by activating the charging switch when the input power supply signal reaches the first predetermined threshold and by deactivating the switch when the input power supply signal reaches the second predetermined threshold.
- the system also includes suitable software and circuitry to carry out the processes described above.
- FIG. 1 illustrates a system for charging a battery in accordance with the inventive arrangements
- FIG. 2 illustrates a method for charging a battery, which can be practiced in, for example, the system of FIG. 1 in accordance with the inventive arrangements;
- FIG. 3 illustrates an example of a rectified input power supply signal in accordance with the inventive arrangements.
- the charging system 100 can include a power source 112 , an inductor I 1 having a first coil 114 and a second coil 116 , a rectifier 118 , a capacitor C 1 , a resistor R 1 , a resistor R 2 and a controller 120 .
- the charging system 100 can further include a charging switch 122 coupled to the battery 110 , a second switch 124 and a backlighting circuit 126 in which the second switch 124 is coupled to the backlighting circuit 126 .
- the controller can control the operation of the charging switch 122 and the second switch 124 .
- the charging system 100 can be a wireless charging system in which the rectifier 118 and the secondary coil 116 of the inductor I 1 are part of the portable electronic device 128 .
- the invention is not limited in this regard, as the charging system 100 can be a conventional charging system in which the inductor 11 and the rectifier 118 are part of a standard charger that can be coupled to the portable electronic device 128 .
- the power source 112 can provide power to the first coil 114 of the inductor I 1 , which can cause a current to be generated in the second coil 116 of the inductor I 1 .
- the rectifier 118 can then rectify this input power supply signal.
- the rectifier 118 can be either a half-wave or a full-wave rectifier.
- the input power supply signal can pass through the charging switch 122 to charge the battery 110 or can pass through the second switch 124 to provide power to the backlighting circuit 126 .
- the controller 120 can have a pair of inputs 130 , 132 , which can be used to permit the controller 120 to monitor the input power supply signal.
- the inputs 130 , 132 can be coupled to analog-to-digital converters, which can convert the input power supply signal to a digital input to permit the controller 120 to process the signal.
- the controller 120 through the inputs 130 , 132 , can determine the voltage level of the input power supply signal, which may continue to fluctuate after the supply signal has been rectified. Based on this determination, the controller 120 can also determine the amount of current flowing through the resistor R 2 , as the value of the resistor R 2 can be programmed into the controller 120 .
- the controller 120 can selectively control the operation of the charging switch 122 and the second switch 124 based on the voltage level of the input power supply signal. As an example, if the voltage level of the input power supply signal drops to a predetermined level, the controller 120 can turn off or deactivate the charging switch 122 and/or the second switch 124 . When the voltage level of the input power supply signal reaches the predetermined level, the controller 120 can turn on or activate the charging switch 122 and/or the second switch 124 .
- the capacitor C 1 is not required to deliver the charging current to the battery 110 when the voltage level of the input power supply signal drops to and below the predetermined level. As a result, the value of the capacitor C 1 , and hence its physical dimensions, can be reduced as compared to a capacitor that would provide charging current when the input power supply signal drops below the predetermined level.
- the capacitor C 1 can have a value high enough to hold the voltage level of the input power supply signal to a minimum value to prevent the controller 120 from disabling the charging sequence when the input power supply signal drops to the predetermined level.
- the capacitor C 1 can also provide current to a logic circuit 134 when the input power supply signal drops to and below the predetermined level. If the power source 112 is removed, e.g., when the battery 110 is fully charged, the capacitor C 1 can discharge though the resistor R 1 . The operation of the charging system 100 will be further described below.
- a method 200 of charging a battery is shown. To explain the method 200 , reference will be made to the system 100 illustrated in FIG. 1 , although it must be noted that the method 200 can be practiced in any other suitable system.
- the method 200 can begin.
- an input power supply signal can be received. This input power supply signal can be used to charge one or more batteries, such as the battery 110 of FIG. 1 , although it may be used for other suitable purposes, too.
- the input power supply signal can be an AC signal, and the input power supply signal can be rectified, as shown at step 214 .
- the input power supply signal can be monitored to determine when the input power supply signal reaches first and second predetermined thresholds.
- the controller 120 can monitor the voltage level of the input power supply signal through the inputs 130 , 132 .
- it can be determined whether the input power supply signal has reached a first predetermined threshold. If it has not, then the method 200 can continue at decision block 218 . If it has, a charging switch that controls the flow of the input power supply signal to a battery can be activated, as shown at step 220 .
- FIG. 3 an example of a rectified input power supply signal 300 is shown.
- a first predetermined threshold 314 and a second predetermined threshold 316 both of which can be predetermined voltage levels, are also illustrated.
- the input power supply signal 300 can have a series of peaks 310 and valleys 312 in which the peaks 310 represent a maximum voltage of the signal 300 and the valleys 312 represent a minimum voltage of the signal 300 .
- the controller 120 can activate the charging switch 122 .
- the charging switch 122 can permit the input power supply signal to charge the battery 110 .
- the charging switch can be deactivated, as shown at step 226 .
- the controller 120 can deactivate the charging switch 122 , which can stop the input power supply signal 300 from reaching the battery 110 .
- the steps 220 and 226 and the decision blocks 218 and 224 can be considered part of a selectively controlling the charging switch step 217 .
- the values of the first predetermined threshold 314 and the second predetermined threshold 316 can be based, at least in part, on the minimum acceptable voltage required to indicate to the controller 120 that a power supply 112 is attached. This indication can prevent the controller 120 from unintentionally disabling a charging sequence. That is, so long as the voltage level that the controller 120 senses through the inputs 130 , 132 remains above the first predetermined threshold 314 and the second predetermined threshold 316 , the controller 120 will sense that the power supply 112 remains present, and the controller 120 will not disable the charging sequence.
- the values of the first predetermined threshold 314 and the second predetermined threshold 316 can be programmed into the controller 120 .
- Selectively activating and deactivating the charging switch 122 in accordance with the above discussion can reduce the value of the capacitor C 1 . More specifically, the minimum value of the capacitor C 1 can be reduced to the value required for the capacitor C 1 to maintain the voltage necessary to indicate to the controller 120 that the portable electronic device is being charged. This reduction in value is made possible primarily because the capacitor C 1 no longer has to maintain a voltage level to continue the charging of the battery 110 when the input power supply signal 300 decreases. The minimum value required of the capacitor C 1 can be reduced as compared to the minimum value required of a capacitor that would supply charging current when the input power supply signal 300 drops below the second predetermined threshold 316 .
- the second predetermined threshold 316 may have a different value than the magnitude of the first predetermined threshold 314 .
- the second predetermined threshold 316 may have a higher value than the first predetermined threshold 314 .
- Deactivating the charging switch 122 at a value higher than when it was activated can permit the capacitor C 1 to supply current to, for example, the logic circuit 134 that is part of the portable electronic device 128 when the input power supply signal 300 drops during its voltage valleys 312 . Because of the increased value of the second predetermined threshold 316 , the capacitor C 1 is also able to maintain the voltage necessary to indicate to the controller 120 that the portable electronic device 128 is still being charged.
- the invention is not limited in this regard, as the first predetermined threshold 314 and the second predetermined threshold 316 can be determined through any other suitable process. Moreover, the magnitude of the second predetermined threshold 316 can be equal to or even less than the magnitude of the first predetermined threshold 314 .
- the capacitor C 1 can also provide current to any other suitable circuitry or component in the portable electronic device 128 . Alternatively, the capacitor C 1 can be used merely to maintain the voltage level needed to indicate to the controller 120 that the device 128 is still being charged.
- the control of a second switch can be synchronized with the control of the charging switch.
- the second switch 124 can be activated and deactivated in accordance with the process described above.
- the controller 120 can activate the second switch 124 when the controller 120 activates the charging switch 122 ; additionally, the controller 120 can deactivate the second switch 124 when the controller 120 deactivates the charging switch 122 .
- Synchronizing the operation of the second switch 124 with the control of the charging switch 122 can further reduce the value of the capacitor C 1 because the capacitor C 1 is not required to provide current to a circuit, such as the backlighting circuit 126 .
- step 228 (see FIG. 2 ) is optional and that any number of second switches 124 can be coupled to any number of other suitable circuits or components.
- step 230 it can be determined whether the charging process is complete. If it is not, the method 200 can resume at step 216 . If it is, the method 200 can continue at step 232 , where the method 200 can end. For example, referring to FIG. 1 , the power source 112 can be removed and the controller 120 will eventually sense the drop in voltage. In response, the controller 120 can disengage the charging sequence, and the capacitor C 1 can drain through the resistor R 1 .
Abstract
Description
- (Not Applicable)
- 1. Technical Field
- This invention relates in general to charging systems and more particularly, to charging systems that rely on rectified charging currents.
- 2. Description of the Related Art
- In today's marketplace, portable electronic devices have become ubiquitous. Because they are portable, nearly all of these devices include rechargeable batteries as their power supply. Such portable devices are equipped with a charger, which can be incorporated in the device or can be a stand-alone unit that can receive the portable device. In either embodiment, the charger typically receives an AC input signal and converts this signal to a DC signal, which is then fed to the cells of the battery. These types of chargers generally include a rectifier that rectifies the incoming AC signal.
- A rectified signal, however, will have a series of voltage peaks and valleys. A capacitor is typically provided in the portable device to supply charging current to the battery as the signal decreases during the voltage valleys. Unfortunately, the capacitor must be relatively large to maintain the necessary voltage, which takes up valuable space in the portable device and adds to the expense of the device or charger.
- The present invention concerns a method of charging a battery. The method includes the steps of receiving an input power supply signal, monitoring the input power supply signal to determine when the input power supply signal reaches first and second predetermined thresholds and in response to the monitoring step, selectively controlling a charging switch that controls the flow of the input power supply signal to the battery. The controlling step includes activating the switch when the input power supply signal reaches the first predetermined threshold and deactivating the switch when the input power supply signal reaches the second predetermined threshold.
- In one arrangement, the method can be practiced in an electronic device that is powered by the battery and that includes a capacitor for maintaining a voltage to indicate that the electronic device is being charged. Practicing the method in the electronic device can reduce the minimum value of the capacitor as compared to the minimum value required of a second capacitor that is used to provide voltage to the battery when the input power supply signal drops below the second predetermined threshold. The method can also include the step of synchronizing with the controlling of the charging switch the control of a second switch that regulates current flow to a circuit. The second switch to the circuit can be activated when the charging switch is activated and deactivated when the charging switch is deactivated. As an example, the circuit can be a backlighting circuit.
- In another arrangement, the method can further include the steps of performing the receiving, monitoring and controlling steps in a wireless charging system and rectifying the input power supply signal. In one embodiment of the invention, the magnitude of the second predetermined threshold can be higher than the magnitude of the first predetermined threshold.
- The present invention also concerns a charging system for charging a battery. The system includes a coil for receiving an input power supply signal, a charging switch for controlling the flow of the input power supply signal to the battery and a controller. The controller can be programmed to monitor the input power supply signal to determine when the input power supply signal reaches first and second predetermined thresholds and in response to the monitoring process, selectively control the charging switch. The controller can selectively control the charging switch by activating the charging switch when the input power supply signal reaches the first predetermined threshold and by deactivating the switch when the input power supply signal reaches the second predetermined threshold. The system also includes suitable software and circuitry to carry out the processes described above.
- The features of the present invention, which are believed to be novel, are set forth with particularity in the appended claims. The invention, together with further objects and advantages thereof, may best be understood by reference to the following description, taken in conjunction with the accompanying drawings, in the several figures of which like reference numerals identify like elements, and in which:
-
FIG. 1 illustrates a system for charging a battery in accordance with the inventive arrangements; -
FIG. 2 illustrates a method for charging a battery, which can be practiced in, for example, the system ofFIG. 1 in accordance with the inventive arrangements; -
FIG. 3 illustrates an example of a rectified input power supply signal in accordance with the inventive arrangements. - While the specification concludes with claims defining the features of the invention that are regarded as novel, it is believed that the invention will be better understood from a consideration of the following description in conjunction with the drawing figures, in which like reference numerals are carried forward.
- Referring to
FIG. 1 , acharging system 100 for charging abattery 110 is shown. Thecharging system 100 can include apower source 112, an inductor I1 having afirst coil 114 and asecond coil 116, arectifier 118, a capacitor C1, a resistor R1, a resistor R2 and acontroller 120. Thecharging system 100 can further include acharging switch 122 coupled to thebattery 110, asecond switch 124 and abacklighting circuit 126 in which thesecond switch 124 is coupled to thebacklighting circuit 126. The controller can control the operation of thecharging switch 122 and thesecond switch 124. - All or portions of the inductor I1, the
rectifier 118, the capacitor C1, the resistor R1, thecontroller 120, the resistor R2, thecharging switch 122, thesecond switch 124, thebacklighting circuit 126 and thebattery 110 can be part of a portableelectronic device 128. In one arrangement, thecharging system 100 can be a wireless charging system in which therectifier 118 and thesecondary coil 116 of the inductor I1 are part of the portableelectronic device 128. Of course, the invention is not limited in this regard, as thecharging system 100 can be a conventional charging system in which the inductor 11 and therectifier 118 are part of a standard charger that can be coupled to the portableelectronic device 128. - The
power source 112 can provide power to thefirst coil 114 of the inductor I1, which can cause a current to be generated in thesecond coil 116 of the inductor I1. Therectifier 118 can then rectify this input power supply signal. Therectifier 118 can be either a half-wave or a full-wave rectifier. The input power supply signal can pass through thecharging switch 122 to charge thebattery 110 or can pass through thesecond switch 124 to provide power to thebacklighting circuit 126. - In one arrangement, the
controller 120 can have a pair ofinputs controller 120 to monitor the input power supply signal. Although not shown, theinputs controller 120 to process the signal. As an example, thecontroller 120, through theinputs controller 120 can also determine the amount of current flowing through the resistor R2, as the value of the resistor R2 can be programmed into thecontroller 120. - Because the
controller 120 monitors the input power supply signal, thecontroller 120 can selectively control the operation of thecharging switch 122 and thesecond switch 124 based on the voltage level of the input power supply signal. As an example, if the voltage level of the input power supply signal drops to a predetermined level, thecontroller 120 can turn off or deactivate thecharging switch 122 and/or thesecond switch 124. When the voltage level of the input power supply signal reaches the predetermined level, thecontroller 120 can turn on or activate thecharging switch 122 and/or thesecond switch 124. In view of this arrangement, the capacitor C1 is not required to deliver the charging current to thebattery 110 when the voltage level of the input power supply signal drops to and below the predetermined level. As a result, the value of the capacitor C1, and hence its physical dimensions, can be reduced as compared to a capacitor that would provide charging current when the input power supply signal drops below the predetermined level. - In one arrangement, the capacitor C1 can have a value high enough to hold the voltage level of the input power supply signal to a minimum value to prevent the
controller 120 from disabling the charging sequence when the input power supply signal drops to the predetermined level. The capacitor C1 can also provide current to alogic circuit 134 when the input power supply signal drops to and below the predetermined level. If thepower source 112 is removed, e.g., when thebattery 110 is fully charged, the capacitor C1 can discharge though the resistor R1. The operation of thecharging system 100 will be further described below. - Referring to
FIG. 2 , amethod 200 of charging a battery is shown. To explain themethod 200, reference will be made to thesystem 100 illustrated inFIG. 1 , although it must be noted that themethod 200 can be practiced in any other suitable system. Atstep 210, themethod 200 can begin. Atstep 212, an input power supply signal can be received. This input power supply signal can be used to charge one or more batteries, such as thebattery 110 ofFIG. 1 , although it may be used for other suitable purposes, too. In one arrangement, the input power supply signal can be an AC signal, and the input power supply signal can be rectified, as shown atstep 214. - At
step 216, the input power supply signal can be monitored to determine when the input power supply signal reaches first and second predetermined thresholds. As an example and as explained earlier, thecontroller 120 can monitor the voltage level of the input power supply signal through theinputs decision block 218, it can be determined whether the input power supply signal has reached a first predetermined threshold. If it has not, then themethod 200 can continue atdecision block 218. If it has, a charging switch that controls the flow of the input power supply signal to a battery can be activated, as shown atstep 220. - Referring to
FIG. 3 , an example of a rectified inputpower supply signal 300 is shown. A firstpredetermined threshold 314 and a secondpredetermined threshold 316, both of which can be predetermined voltage levels, are also illustrated. The inputpower supply signal 300 can have a series ofpeaks 310 andvalleys 312 in which thepeaks 310 represent a maximum voltage of thesignal 300 and thevalleys 312 represent a minimum voltage of thesignal 300. As an example and referring toFIGS. 1 and 3 , when the inputpower supply signal 300 reaches a firstpredetermined threshold 314, thecontroller 120 can activate the chargingswitch 122. When activated, the chargingswitch 122 can permit the input power supply signal to charge thebattery 110. - Referring to
method 200 ofFIG. 2 once again, atdecision block 224, it can be determined whether the input power supply signal has reached the second predetermined threshold. If it has not, themethod 200 can resume atdecision block 224. If it has, the charging switch can be deactivated, as shown atstep 226. As an example and referring back toFIGS. 1 and 3 , when the inputpower supply signal 300 reaches the secondpredetermined threshold 316, thecontroller 120 can deactivate the chargingswitch 122, which can stop the inputpower supply signal 300 from reaching thebattery 110. Moving back toFIG. 2 , thesteps switch step 217. - In one arrangement, referring to
FIGS. 1 and 3 , the values of the firstpredetermined threshold 314 and the secondpredetermined threshold 316 can be based, at least in part, on the minimum acceptable voltage required to indicate to thecontroller 120 that apower supply 112 is attached. This indication can prevent thecontroller 120 from unintentionally disabling a charging sequence. That is, so long as the voltage level that thecontroller 120 senses through theinputs predetermined threshold 314 and the secondpredetermined threshold 316, thecontroller 120 will sense that thepower supply 112 remains present, and thecontroller 120 will not disable the charging sequence. The values of the firstpredetermined threshold 314 and the secondpredetermined threshold 316 can be programmed into thecontroller 120. - Selectively activating and deactivating the charging
switch 122 in accordance with the above discussion can reduce the value of the capacitor C1. More specifically, the minimum value of the capacitor C1 can be reduced to the value required for the capacitor C1 to maintain the voltage necessary to indicate to thecontroller 120 that the portable electronic device is being charged. This reduction in value is made possible primarily because the capacitor C1 no longer has to maintain a voltage level to continue the charging of thebattery 110 when the inputpower supply signal 300 decreases. The minimum value required of the capacitor C1 can be reduced as compared to the minimum value required of a capacitor that would supply charging current when the inputpower supply signal 300 drops below the secondpredetermined threshold 316. - In one arrangement, the second
predetermined threshold 316 may have a different value than the magnitude of the firstpredetermined threshold 314. For example, the secondpredetermined threshold 316 may have a higher value than the firstpredetermined threshold 314. Deactivating the chargingswitch 122 at a value higher than when it was activated can permit the capacitor C1 to supply current to, for example, thelogic circuit 134 that is part of the portableelectronic device 128 when the inputpower supply signal 300 drops during itsvoltage valleys 312. Because of the increased value of the secondpredetermined threshold 316, the capacitor C1 is also able to maintain the voltage necessary to indicate to thecontroller 120 that the portableelectronic device 128 is still being charged. - Of course, the invention is not limited in this regard, as the first
predetermined threshold 314 and the secondpredetermined threshold 316 can be determined through any other suitable process. Moreover, the magnitude of the secondpredetermined threshold 316 can be equal to or even less than the magnitude of the firstpredetermined threshold 314. The capacitor C1 can also provide current to any other suitable circuitry or component in the portableelectronic device 128. Alternatively, the capacitor C1 can be used merely to maintain the voltage level needed to indicate to thecontroller 120 that thedevice 128 is still being charged. - Referring back to the
method 200 ofFIG. 2 , atoption step 228, the control of a second switch can be synchronized with the control of the charging switch. For example, referring once again toFIGS. 1 and 3 , thesecond switch 124 can be activated and deactivated in accordance with the process described above. Thus, thecontroller 120 can activate thesecond switch 124 when thecontroller 120 activates the chargingswitch 122; additionally, thecontroller 120 can deactivate thesecond switch 124 when thecontroller 120 deactivates the chargingswitch 122. Synchronizing the operation of thesecond switch 124 with the control of the chargingswitch 122 can further reduce the value of the capacitor C1 because the capacitor C1 is not required to provide current to a circuit, such as thebacklighting circuit 126. It is understood, however, that step 228 (seeFIG. 2 ) is optional and that any number ofsecond switches 124 can be coupled to any number of other suitable circuits or components. - Referring back to the
method 200 ofFIG. 2 , atdecision block 230, it can be determined whether the charging process is complete. If it is not, themethod 200 can resume atstep 216. If it is, themethod 200 can continue atstep 232, where themethod 200 can end. For example, referring toFIG. 1 , thepower source 112 can be removed and thecontroller 120 will eventually sense the drop in voltage. In response, thecontroller 120 can disengage the charging sequence, and the capacitor C1 can drain through the resistor R1. - While the preferred embodiments of the invention have been illustrated and described, it will be clear that the invention is not so limited. Numerous modifications, changes, variations, substitutions and equivalents will occur to those skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (15)
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US10/722,804 US7626365B2 (en) | 2003-11-26 | 2003-11-26 | Charging system and method |
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US10/722,804 US7626365B2 (en) | 2003-11-26 | 2003-11-26 | Charging system and method |
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EP2632014A1 (en) * | 2012-02-21 | 2013-08-28 | LG Innotek Co., Ltd. | Wireless power receiver and method of managing power thereof |
US10222777B2 (en) * | 2014-12-03 | 2019-03-05 | Mitsubishi Electric Corporation | Input-output device |
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US9219378B2 (en) * | 2010-11-01 | 2015-12-22 | Qualcomm Incorporated | Wireless charging of devices |
CN102065581A (en) * | 2010-12-28 | 2011-05-18 | 惠州Tcl移动通信有限公司 | Video communication device and method |
US20120194124A1 (en) * | 2011-01-31 | 2012-08-02 | Nokia Corporation | Wireless Battery Charging System |
US10173539B2 (en) * | 2012-08-31 | 2019-01-08 | Siemens Aktiengesellschaft | Battery charging system and method for cableless charging of a battery with voltage and current sensors on both the primary and secondary sides and a DC-DC converter on the primary side involved in an efficiency calibration power loop |
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US20080084179A1 (en) * | 2003-01-08 | 2008-04-10 | Hitachi, Ltd. | Power Control Unit |
US7692430B2 (en) | 2003-01-08 | 2010-04-06 | Hitachi, Ltd. | Power control unit |
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US8120365B2 (en) | 2003-01-08 | 2012-02-21 | Hitachi, Ltd. | Power control unit |
US20120091812A1 (en) * | 2010-10-15 | 2012-04-19 | Upi Semiconductor Corp. | Power switching device |
EP2632014A1 (en) * | 2012-02-21 | 2013-08-28 | LG Innotek Co., Ltd. | Wireless power receiver and method of managing power thereof |
US9531444B2 (en) | 2012-02-21 | 2016-12-27 | Lg Innotek Co., Ltd. | Wireless power receiver and method of managing thereof |
US9531441B2 (en) | 2012-02-21 | 2016-12-27 | Lg Innotek Co., Ltd. | Wireless power receiver and method of managing power thereof |
US9537539B2 (en) | 2012-02-21 | 2017-01-03 | Lg Innotek Co., Ltd. | Wireless power transmitter and method of managing thereof |
US10222777B2 (en) * | 2014-12-03 | 2019-03-05 | Mitsubishi Electric Corporation | Input-output device |
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